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19 May 2020 Ultrastructural Analysis of Mouthparts of Adult Horn Fly (Diptera: Muscidae) From the Brazilian Midwest Region
Fernando de Freitas Fernandes, Ana Cristina Bahia, Nágila Francinete Costa Secundino, Paulo Filemon Paolucci Pimenta
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Abstract

The ultrastructure of the mouthparts of Haematobia irritans (L.) was investigated by scanning electron microscopy. The morphological characteristics of the maxillary palps, labium (prementum and postmentum), labrum, hypopharynx, haustellum, and labellar lobes are described, as well as of the sensilla evidenced on all the surface of the mouthparts, and the set of different positions assumed by the mouth apparatus of this fly. Based on their morphology, 12 well-differentiated sensilla were identified, among three types of cuticular sensilla: trichoidea, coeloconica, and campaniformia. A slight sexual dimorphism in the sensilla patterns found in the mouthparts of H. irritans was evidenced. These observations are discussed with reference to the current literature on the functional morphology of sense organs of Insecta. These results could facilitate the recognition of the chemosensory sensilla by electrophysiological techniques, and foment future taxonomic and phylogenetic studies to better elucidate the evolution of Diptera, Muscomorpha.

© The Author(s) 2020. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.
Fernando de Freitas Fernandes, Ana Cristina Bahia, Nágila Francinete Costa Secundino, and Paulo Filemon Paolucci Pimenta "Ultrastructural Analysis of Mouthparts of Adult Horn Fly (Diptera: Muscidae) From the Brazilian Midwest Region," Journal of Medical Entomology 57(5), 1447-1458, (19 May 2020). https://doi.org/10.1093/jme/tjaa085
Received: 17 December 2019; Accepted: 3 April 2020; Published: 19 May 2020
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KEYWORDS
blood-sucking flies
feeding position
maxillary palp
sensilla
Stomoxydinae
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